Chemistry is the study of the behavior and composition of matter. All foods

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问题    Chemistry is the study of the behavior and composition of matter. All foods are
made up of chemical substance which undergoes chemical changes when cooking                   【M1】________
in an oven or digested within the body. The cooking of meat and vegetables induce             【M2】________
chemical changes, making it more delicious; similarly the leavening action of                   【M3】________
baking powder is a straightforward chemical change, as is the conversion of starch into sweet sugars by digestion.
Cookery is a science requiring a knowledge of chemistry.                                        【M4】________
This is evident from the variety of cooking products and
food additives available as cooking oils, fats, colorings, sweeteners, tenderizers, flavorings, screaming
agents, preservatives, etc. Each is carefully prepared before painstaking research.             【M5】________
It is therefore essential for trained cookers to understand                               【M6】________
chemical science in order to appreciate the chemistry nature of foods                         【M7】________
and the changes achieving on cooking. Homeworkers should also                                  【M8】________
know cleansing agents and textiles used in the home and how the latter                         【M9】________
responds to the effects of heat, light, water, and chemical cleansing                         【M10】________
agents. [br] 【M3】

选项

答案 it→them

解析该句话的意思是“肉类和蔬菜的烹饪引发化学变化，使其更加美味”，更加美味的是肉类和蔬菜，所以将it改为them。

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Chemistry is the study of the behavior and composition of matter. All foods

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